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Method for inhibiting current harmonics based on FFT (Fast Fourier Transform)

A technology of Fourier transform and current suppression, applied in AC network to reduce harmonic/ripple, harmonic reducing device, measuring current/voltage, etc., can solve the problem of large error, inability to obtain harmonic amplitude and phase information, design Difficulty and other issues

Inactive Publication Date: 2016-07-13
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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Problems solved by technology

The center frequency of the analog filter detection method is very sensitive to the component parameters, etc., the design is difficult, and the error is large; the detection method based on the instantaneous reactive power theory now includes the method, method and method, and these methods detect the sum of each harmonic , the amplitude and phase information of each harmonic cannot be obtained

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  • Method for inhibiting current harmonics based on FFT (Fast Fourier Transform)
  • Method for inhibiting current harmonics based on FFT (Fast Fourier Transform)
  • Method for inhibiting current harmonics based on FFT (Fast Fourier Transform)

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Embodiment Construction

[0020] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] Aiming at the requirement of extracting the sum of the harmonic components satisfying the conditions, the present invention proposes a fast Fourier transform-based aircraft AC power harmonic detection method, but it is not a limitation of the present invention, and the embodiment is only The principle of the present invention is explained, and various improvements will be made in the present invention, and these improvements all fall within the protection scope of the present invention. This example illustrates its implementation process through Matlab simulation software.

[0022] (1) For the typical waveform of the load current of the rectifier circuit, see figure 2 ;

[0023] (2) AC power frequency is f=400Hz;

[0024] (3) Determine the frequency f of the A / D converter of the DSP processor for sampling the load current s = 50k...

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Abstract

The invention belongs to the technical field of power grid harmonic detection, and relates to a method for inhibiting current harmonics based on FFT (Fast Fourier Transform). According to the technical scheme of the invention, the method can extract any harmonic and the sum of harmonic components meeting conditions. When a load harmonic current exceeds the compensation capacity of an APF, the method can select the characteristic harmonics with the bigger dangers to be compensated. The method can carry out IFFT of the harmonics meeting the conditions, and then extracts the sum of a part of harmonic components, so that the APF just compensates the needed harmonics in an occasion where the method is used cooperatively with a passive filter.

Description

technical field [0001] The invention belongs to the technical field of grid harmonic detection and relates to a method for suppressing current harmonics based on fast Fourier transform. Background technique [0002] Aviation AC power is usually converted into DC by an AC / DC full-bridge rectifier circuit to supply high power density DC / DC switching power supplies of various topologies. With the demand for weapons and equipment, more and more power electronic devices inject a large amount of harmonics into the grid, making the current of the aviation AC power supply system non-sinusoidal, or the current is sinusoidal but out of phase with the grid voltage. This can cause problems such as reduced energy transfer efficiency and overheating of electrical equipment. All countries in the world pay full attention to the harmonic problem. Many academic conferences on harmonic problems have been held internationally. Many countries and international academic organizations have formul...

Claims

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Application Information

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IPC IPC(8): H02J3/01G01R19/00
CPCY02E40/40
Inventor 孙百军邹晓渔施宏
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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